// In header: <boost/xpressive/regex_actions.hpp>

template<typename This, typename Sequence> 
struct result<This(Sequence)> {
  // types
  typedef remove_reference< Sequence >::type                                                                                              sequence_type;
  typedef mpl::if_c< is_const< sequence_type >::value, typename sequence_type::const_reference, typename sequence_type::reference >::type type;         
};